Seam Sealer

Discussion in 'Gear Chat' started by Fossil Bluff, Sep 22, 2020.

  1. Fossil Bluff

    Fossil Bluff Thru Hiker

    I haven't sealed a flysheet for over a year... Can someone remind me how long neat silnet takes to dry?
  2. Shewie

    Shewie Administrator Staff Member

    Neat?
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  3. Fossil Bluff

    Fossil Bluff Thru Hiker

    Yes, its a few finger smears across the base of my mat :D
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  4. Chiseller

    Chiseller Thru Hiker

    Neat and genuine seam sealant seems to take hours for me... Diluted home made seems to take half the time.

    I wish I knew what exped seam grip/seal was... Ten minutes and it's pretty good to go!
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  5. Fossil Bluff

    Fossil Bluff Thru Hiker


    Ta, mate. I was going to thin it but couldn't be arsed with going out to the shed for white spirit :D


    Its going off a bit now... 4 hours later
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  6. Mole

    Mole Thru Hiker

    I treated our Stratospire 2 ridge with neat Silnett last year. ( After it leaked during 16 hours continuously solid downpour). Did it in the "field" in Knoydart.
    Applied it about 6pm. Was dry enough to pack up next morning. Hasn't leaked ,had 30+ nights use since.

    It goes off quicker in humid air.
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  7. Fossil Bluff

    Fossil Bluff Thru Hiker

    That’s interesting about the humidity ...

    Thank you :)
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  8. WilliamC

    WilliamC Thru Hiker

    It's the humidity that cures the silicone, rather than the silicone drying.
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  9. Fossil Bluff

    Fossil Bluff Thru Hiker

    Is it ... blimey, id not s'pose there's a simple way of explaining that? one that I would understand :D
  10. WilliamC

    WilliamC Thru Hiker

    I found this: "Chemically, what happens during curing is that tiny water molecules creep into the silicone. There they chemically react with the components of the silicone adhesive and create a by-product."
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  11. Fossil Bluff

    Fossil Bluff Thru Hiker

    Splendid - so that explains why my tube goes hard in the shed overnight... Ahem, I refer, of course, to my bathroom sealant :D
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  12. WilliamC

    WilliamC Thru Hiker

    I've put the latest unfinished tube in the freezer, in the hope that it will be low humidity and so stay soft.
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  13. Fossil Bluff

    Fossil Bluff Thru Hiker

    Let us know how it turns out?

    Although I would rather find a pork chop in may freezer :D
  14. Stuart

    Stuart Ultralighter

    How do you do home made sealant?
  15. Chiseller

    Chiseller Thru Hiker

    Mix the sealant of choice from the DIY shop with white spirit. Everyone has different ratios, I tend to favour equal amounts by weight.
    There's a thread on here somewhere...
  16. Stuart

    Stuart Ultralighter

    Cheers. I can't see a thread that mentions this.

    When you say sealant from a DIY shop, do you mean the stuff you put round the bath or a door frame with a sealing gun?

    What's the advantage of this over "proper" tent sealant? I think I can guess, but maybe I'm wrong.
  17. Mole

    Mole Thru Hiker

    Clear silicone - the plain stuff.

    Advantage is you get about 50x the amount silicone for half the cost...

    But it does need dilution.


    Pure silnett is formulated to stick well, be tough and flexible on curing. Normal silicone will likely peel off if not diluted. Diluted thinner it sticks better, penetrates needle holes.

    Olive Oli consistency works well for me. Which is 1:4 or 5 ish .


    Much thinner for reproofing floors.
  18. Stuart

    Stuart Ultralighter

    Yes, the clear one but it's the one in those plastic tubes, use with the gun for round the bath or sink etc etc?

    You get ones to use inside and outside. Which one do you use?

    Sorry to be pedantic, don't want ruin my tent!
  19. Shewie

    Shewie Administrator Staff Member

    Last shelter I sealed I used some left over interior transparent Unibond bathroom sealer, roughly 1:2 but not really measured

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